Sulphurous Sea

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The Sulphurous Sea, also known as the Sulphur Sea, is a biome added by the Calamity Mod which spawns upon world creation. It replaces the Ocean on the Dungeon side, and is located on top of the Abyss. Its water is turquoise colored, and it contains a hole leading to the Abyss.

It is entirely composed of Sulphurous Sand, which can spawn dangerous sulphur bubbles when underwater. These bubbles can't hurt the player until they have reached their maximum size. They deal 20 damage and inflict Venom for 2 seconds. The water is also hazardous, inflicting Sulphuric Poisoning that grows more damaging the longer the player stays in it. Coral, Seashell and Starfish also grow faster in this biome.

Rain in this biome will become acidic inflicting the Acid Rain debuff onto the player, and buffing enemy stats. Irradiated Slimes will also spawn during this event that will drop the Lead Core.

The Aquatic Scourge boss can spawn here naturally (but very rarely) or can be summoned here by using Seafood.

Contents[edit | edit source]

Sulphurous Sea
Characters Unique Treasures Unique Drops
Aquatic ParasiteAquatic Parasite
Aquatic SeekerAquatic Seeker
Aquatic UrchinAquatic Urchin
Catfish (enemy)Catfish (enemy)

During rain:

Irradiated SlimeIrradiated Slime


Aquatic ScourgeAquatic Scourge
From Water Chests:
Breathing ReedBreathing Reed
Water Walking BootsWater Walking Boots

From Pots:

GlowstickGlowstick (2-5 / 3-11)
Jester's ArrowJester's Arrow (10-20)
Anechoic CoatingAnechoic Coating
Healing PotionHealing Potion
Endurance PotionEndurance Potion
Flipper PotionFlipper Potion
Gills PotionGills Potion
Gravitation PotionGravitation Potion
Heartreach PotionHeartreach Potion
Inferno PotionInferno Potion
Lifeforce PotionLifeforce Potion
Magic Power PotionMagic Power Potion
Obsidian Skin PotionObsidian Skin Potion
Regeneration PotionRegeneration Potion
Shine PotionShine Potion
Spelunker PotionSpelunker Potion
Water Walking PotionWater Walking Potion

From Aquatic Urchin:

Urchin StingerUrchin Stinger

From Trasher:

Trash Can (pet)Trash Can (pet)

From Catfish (enemy) and Trasher:

Diving HelmetDiving Helmet

From Gnasher in Hardmode:

Turtle ShellTurtle Shell

From Trasher in Hardmode:


From Mauler:

Shark FinShark Fin

From Irradiated Slimes:

Lead CoreLead Core

From Radiators caught with a Bug Net:

Radiating CrystalRadiating Crystal

From Mauler after defeating Polterghast:

Sulphuric Acid CannonSulphuric Acid Cannon

From terrain:

Sulphurous SandSulphurous Sand
Water ChestWater Chest

From Fishing:

Abyssal CrateAbyssal Crate
Abyssal AmuletAbyssal Amulet
Alluring BaitAlluring Bait
Planty MushPlanty Mush
Anechoic PlatingAnechoic Plating (in Hardmode)
Depths CharmDepths Charm (in Hardmode)
Iron BootsIron Boots (in Hardmode)
Strange OrbStrange Orb (in Hardmode)
Red SnapperRed Snapper

Fishing[edit | edit source]

Fishing in the Sulphurous Sea will warrant different catches based on fishing power, and are as follows:

Notes[edit | edit source]

  • Player-created Sulphurous Sea biomes are possible by placing at least 30 Sulphurous Sand in an area.
  • The Sulphurous Sea biome is defined by world position rather than the blocks present, meaning that a Dungeon-side Ocean initially generated without Calamity installed will still be considered as a Sulphurous Sea, and contain all of its enemies and effects. An artificial Sulphurous Sea can also be created by using Sulphurous Sand.
  • Having the Aquatic Scourge Lore item in your inventory will grant immunity to the sulphuric water.

Tips[edit | edit source]

  • This area is very dangerous for early game players, as it houses many strong enemies, like the Mauler.

Trivia[edit | edit source]

  • The theme heard while in the Sulphurous Sea is wasteland, which was composed by the artist DM DOKURO.
    • If the Calamity Music add-on mod is disabled, the Desert's theme will play instead.
  • The turquoise coloration of the water is representative of real life volcanic sulphuric lakes.
  • Due to the urine-like coloration of the biome's water in previous versions of the mod, this biome has been known by the community as the "piss sea/ocean".
  • Water Walking Potions are twice as likely to drop from the Pots over other potions.

Lore[edit | edit source]

A festering shore, where waves hiss upon lapping the crumbling stone of the beach. This is the Sulphur Sea, where the air stings your eyes, and each breath is a labor. Centuries ago, this was an ordinary coast, where the sun glimmered across blue waters, and fish danced in the light. A paradise, yet to Yharim, a simple tool; nothing more than a tomb for disposal of the dead who were of no importance. The beginning of Yharim’s rule was unimaginably harsh, far worse than those who came before him. His first action upon taking the throne was to enforce control upon much of the surrounding kingdoms, cities, and capitals. He succeeded in it all. Any who resisted further had their people massacred, or captured to serve under inhumane conditions, where they often collapsed, or ended their own lives to escape a worse fate. Inevitably, the body count rose. This increased further until finally, given no other options to dispose of the bodies, Yharim turned to what is now the Sulphur Sea.

At first, it was but a gradual flow of corpses, only those of which could not be contained within the dungeon’s crypts. This continued for quite some time, until a threat soon arose from the spirits of the dead. A raging amalgamation of hatred and desires, which tore through any of the forces sent to dispose of the bodies into the dungeon; Yharim realized it would be unwise to feed more souls to the growing threat. Thus, he began to dispose of more corpses into the far ocean. The once crystal clear waters turned dark with the blood and entrails of many, choking life out of its waters. This process destroyed the delicate and precious ecosystem. Only the hardiest and most desperate of the creatures in its bay clung onto their last hopes, and soon had adapted to the toxic environment. As the years passed, the waters suffered only more offenses, serving further despicable purposes, such as the containment of Silva, or the dumping grounds for the runoff of Draedon’s experiments. At last, Yharim’s rule as a Tyrant had been solidified, allowing no resistance, or his anger was pacified. The flow of corpses was stemmed, and the cruel practice had ended. However, the damage was done. The sea was irreparably ruined, though now, centuries later, the only trace of the assault on the ecosystem is the stained beach, and poisoned water. Dangerous and toxic creatures swim within its murky waters, devouring any life which would stray into their presence. This is the Sulfurous Sea, a story and example of the extent of the Tyrant’s tragic rule.